Here is the pinout as I found somewhere on the web:
1 5
|------^------|
|o o o o o|
|o o o o o|
|-------------|
6 10
(looking at the port from the outside)
Only pins 2 (RX), 3 (TX), 7 (RTS), 8 (CTS) are connected. Pin 5 in
GROUND.
hth
Reinhard